Yeah, that is what I thought.
I have now added you, so you should be able to make changes.
After you register your wiki name, you have to get an existing user to add you to TWikiUsersGroup. This was put into place as a safeguard against some spammer problems we have had in the past. For anyone else who is reading this (in the future or what have you), it is typically easiest to come into the irc channel real quick and ask to be added.